🛡️ CVE-2026-48822

🟡 CVSS 5.8 — Medium ✅ No Known Exploit CWE-79 NVD
5.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Shaarli is a personal bookmarking service. Versions 0.16.1 and prior contain a stored Cross-Site Scripting (XSS) vulnerability in the Markdown-to-HTML conversion process used in the Bookmark Description field. An authenticated user can inject a malicious javascript: URI inside a Markdown link. The vulnerability originates in the filterProtocols method within BookmarkMarkdownFormatter.php.This method attempts to sanitize Markdown links by filtering dangerous protocols (such as javascript:) before rendering. It uses the following regular expression: (#]\((.*?)\)#is). This regex is designed to detect inline Markdown links, but it fails to detect Markdown reference-style links because reference-style links are resolved by the Markdown parser after preprocessing. The filterProtocols method never inspects the actual URL used in these references and as a result, an attacker can supply a javascript: URI inside a reference definition. This issue has been fixed in version 0.16.2.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs administrative privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability none.

Weakness class

CVE-2026-48822 is classified as CWE-79: Cross-site Scripting (XSS). User-supplied data is written into a page without escaping, so attacker script runs in the browser of anyone who views it.

Affected software

CVE-2026-48822 is recorded against 1 package.

  • unknown

Timeline and source

Published on 17 June 2026 and last revised on 18 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com
github.com
github.com

Details

Severity MEDIUM
CVSS Score 5.8
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N
CWE CWE-79
Public Exploit ✅ No
Source NVD
Published 2026-06-17
Updated 2026-08-11
Modified 2026-06-18
Fix URL N/A

Affected Packages

Software From version Fixed in
unknown — —

Similar Threats

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